prologue - definition and synonyms

noun [countable] 

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/ˈprəʊlɒɡ/
singularprologue
pluralprologues
  1. 1
    literature a piece of writing at the start of a book that introduces the story
    1. a.
      theatre, cinema the beginning of a play, film, or television programme that introduces the story
  2. 2
    an event that leads to another event
    prologue to:

    rumblings of discontent that were a prologue to war